Bed-and-cylinder printing-press



Patented Dab. l3, I898.

C. POTTER. BED AND CYLINDER PRINTING PRESS.

( pp cation filed Nov. 23, 1895.

THE NORRIS PETERS CO, PHOTO-LITHOu WASH (No Model.)

No. 65,897. Patented Dec. I3, I898.

C. POTTER.

BED AND CYLINDER PRINTINGPRESS.

(Application filed Nov. 28, 1895.|

(No Model.) 3 Sheets-Sheat 3.

8 4- 63$ mu 69 W W WITNESSES: INVENTOR 5, J. -4 f-mwf r K r\ m: "bums versus ca. PHOTO-Limo" wAsmr-i'fmnn.

NITED STATES CHARLES POTTER, OF PLAINFIELD, NEiV JERSEY.

BED-AND-CYLINDER PRlNT lNG-PRESS SPECIFICATION forming part of Letters Patent No. 615,897, dated December 13, 1898.

Application filed November 23, 1895. Serial No. 569,887- N model.)

To all whom it may concern.-

Be it known that I, CHARLES POTTER, a citizen of the United States of America, residing at Plainfield, Union county, New Jersey, have invented certain new and useful Improvements in Bed-and-Oylinder Printing-Presses, of which the following is a specification.

' My invention relates to single-revolution printing-presses of the bed-and-cylinder type. It is more particularly of that type which has for its features the governing of the relative movements of the rotary impression-cylinder and reciprocating bed in such manner that they shall travel with the same speed while the impression takes place, but on the return movement of the bed the latter shall move at a surface speed considerably greater than that of the cylinder. Otherwise expressed, the speed of the cylinder is accelerated during the time of impression sufficiently to conform to the motion of the bed and retarded during the remainder of the same'revolution to enable the bed to resume its initial position.

It has for its object to provide for mounting the bed so that it may reciprocate and be supported in or on an accurate guiding means, shall move with little friction, and so that the construction is simplified by dispensing with the usual antifriction supporting rollers, which latter involve much expense in manufacture and donot give a solid and immovable support to the bed.

Briefly stated, the press is preferably constructed in part by connecting the bed with the cylinder through the medium of actuating devices which cause a single revolution of the cylinder to take place for each reciprocation of the bed, said devices including an eccentric cylinder-driving device which will give to the cylinder fast and slow movements relative to the bed at proper timesthat is to say, an accelerated movement while the impression is being made and a slow movement during the return of the bed, whereby the latter is enabled to meet the cylinder for a new impression at the beginning of the next revolution of the cylinder, the latter consequently making a single revolution for each complete reciprocation of the bed. In other words, the speed of the cylinder is accelerated to corre- ,/spond with that of the bed during the impression.

same.

The invention consists mainly in mounting the bed in a trough-shaped guide or guides adapted to contain a considerable quantity of oil, the bed being provided with one or more runners adapted to accurately fit the guide. In addition to the foregoing I make the runners hollow and provide means whereby the body of oil is forced through the runners at each reciprocation. I furthermore preferably perforate the runners, so that the oil may readily pass from their interiors to the engaging surfaces of the runners and guides, thereby always providing or renewing a film of oil, upon which the runners maybe supported and travel.

Such being the general nature of my invention, I have shown in the accompanying drawings means for carrying the same into practical effect without limiting the improvements in their useful applications to the particular construction which for the sake of illustration I have delineated.

In said drawings, Figure l is a side elevation of a printing-press embodying my invention. Fig. 2 is a longitudinal sectional view of the Fig. 3 is a transverse sectional view on line III, Fig. 1. Fig. iis ahorizontal section on line IV, Fig. 3. Fig. 5 is a vertical sectional View on line V, Fig. 4. Fig. 6 is a vertical transverse sectional view through the eccentric driving device of the impressioncylinder.

Referring to the drawings, 1 indicates the main supporting-frame of the press, having brackets 2, upon which may be supported in the usual manner the impression-cylinder 3 through the medium of its shaft 4.

1 5 tea feed board or table typical of a feed device of any suitable character for furnishing sheets to the cylinder either from a pile or other source of supply.

6 indicates the bed, adapted to reciprocate beneath the impression-cylinder 3 and to be inked from any preferred form of inking de-.

shaft mounted in the frame 1 and adapted to.

be driven by any convenient motor. Fixed on said shaft is a pinion 10, which meshes with a gear-wheel ll, fixed on a transverse shaft 12, supported at its outer end in a bearing of the frame 1 and at its inner end in a bearing 13, carried by a frame-post or bracket 14:. At its inner end the shaft 12 has a means for converting its rotary into a reciprocating movement, such as a crank 15, fixed upon the shaft and carrying a pin or wrist 16. The latter engages an upwardly and downwardly extending slot 17, formed in a cross-head or yoke 18, and the latter is fixed on a longitudinal reciprocating slide or bar 19, mounted in suitable bearings 20 of the main frame 1. The bar 19 is situated in proximity to a lever 21, which is pivotally mounted at 22 near the base of the frame and extends upward toward and near the path of the bed, with which latter it is connected by a link 23. The reciprocating bar 19 engages the lever 21 so as to oscillate it, preferably by means of a vertically-slotted bracket 24, carried by the bar, in which bracket fits a pin or projection 25, fixed on the lever.

It will be observed from the construction above described that if the power-shaft 9 and gearing connected therewith be rotated, as in the direction indicated by the arrows, the bed will be reciprocated beneath the cylinder upon its guides S, the described parts being of the proper proportion to give the necessary length of reciprocation to the bed.

The impression-cylinder is connected with the above-described operating mechanism of the bed, such connection including an eccentric driving device by which the surface speed of the cylinder is varied. This device may be otherwise described as an accelerator or accelerating means for increasing the surface speed of the cylinder at the proper time-for instance, when the bed meets the cylinder for the making of the impression. At this time the surface speed of the bed, when driven by the described or equivalent mechanism, is also increasing, and it will be understood that the eccentric or accelerating driving device of the cylinder will be so proportioned relative to the bed-reciprocating mechanism that the rates of acceleration of the bed and cylinder while the latter are in contact shall be equal. The most convenient means for this purpose consist of a rotary part adapted to bear against and slide along the surface of another rotary part, one of said parts being connected with the cylinder and the other with the driving mechanism. In the construction illustrated I have shown the firstmentioned part in the form of a pin connected with the driving mechanism to rotate eccentrically to the cylinder and the said other part in the form of a slotted disk connected with the cylinder; but such arrangement is capable of inversion without departing from the invention.

Referring now to Figs. 1, 3, and 6 of the drawings, the shaft 4 of the impression-cylinder extends beyond one of its bearings and has fixed upon its end a part, arm, or disk 26, having a bearin -surface such as that furnished by the slot indicated at 27. 28 is a pin engaging said slot and carried by the cocentric or accelerating driving device, the latter being in the construction illustrated formed by a gear-wheel 29, mounted, so as to rotate around eccentrically to and independent of the impression-cylinder shaft, upon a hollowbearing, collar, or bracket 30, the latter being fixed upon the main frame 1, so as to surround said shaft. The gear-wheel 29 is driven in proper time from the shaft 9 by any suitable gearingas, for instance, by the gear 11 and an intermediate gear 31, which connects the gear 11 with the gear 29.

The parts are so arranged and proportioned relative to each other that as the bed comes into contact with the impression-cylinder for making an impression the pin 28 approaches the inner end of the slot 27 and arrives at said inner end at the time when the bed is at its maximum speed. Consequently at this time the said pin will impart its maximum degree of angular or rotary movement to the impression-cylinder. As the bed passes beyond the cylinder and becomes disengaged therefrom the pin 28 will move toward and finally reach the outer end of the slot 27, with the result of giving a constantly-decreasin g speed of rotation to the cylinder. Asthe bed returns beneath the cylinder to resume its initial position the pin 28 will be farthest from the shaft 4,will turn the impression-cylinder at its lowest rate of speed, and will aiford the necessary time or delay for the return of the bed.

It will be understood that during the return of the bed the cylinder may be lifted in a well-known manner or the inoperative side of the same may be of slightly less radius, either construction serving to prevent the touching of the bed and cylinder while the former is returning to initial position.

During the making of the impression I prefer to eifect a positive engagement between the cylinder and bed, and to this end I provide the bed with one or more toothed racks 32 and fix on the cylinder a corresponding geared segment or segments 33 of sufficient lengtl1--for instance, equal to approximately a semicireumference of the cylinder.

Referring now to the means for supporting and guiding the reciprocating bed, the guides 8, hereinbefore mentioned, are made in the form of troughs having side walls 34; of sufficient height to hold the desired depth of oil and end walls 35, preferably of greater height, to prevent the dashing over of the oil as the bed nears the ends of its travel. For

the latter purpose I prefer to combine with the end wall 35 side walls 36 of greater height than the walls 8 and an overhanging flange 37, the whole forming hoods h, adapted to catch and retain the oil as itis collected, in-

creased in depth, and thrown up at the ends of the guides by the reciprocation of the bed. The supports or runners of the bed are shown at 38 hollow, so as to form a longitudinal chamber 39, which opens at each end into the trough of the guide. The reciprocation of the bed consequently may take'place in the presence of or through the body of oil without displacing the latter entirely, but only increasing its height or level first at one end of the trough and then at the other, and thereby compelling it to flow through the runner to the empty end of the trough. This flowing of the oil keeps the runners perfectly lubricated. By preference I form the ends of the runners with beveled surfaces 450 to scoop the oil from the interior of the trough and direct it into the end of the runner-chamber. I also form the chamber 39 with one or more openings 41, through which the oil contained in the chamber is distributed during the travel of the bed along the bottom of the trough. The surfaces which take the weight of and support the bed are thus constantly separated bya film of oil. As the bed reaches the end of its stroke the collected body of oil Willbe contained within the hood h and forced into the runner-chamber. For more entirely inclosing such bodyof oil the top flange 37 of the hood is arranged to enter the runnerchamber, as seen in Fig. 5.

I claim- 1. In a printing-press the combination with the bed, ofa trough-shaped supporting-guide therefor, and a hollow runner fitting within the guide and open at both ends for the passage of the oil.

2. In a printing-press the combination with the bed, of a trough-shaped guide having a hood at the end, and a hollow runner fitting within the guide and adapted to receive the oil collected by the hood. Y

3. In a printing-press the combination with the bed, of a trough-shaped supporting-guide having a hood at each end, and a hollow runner open at each end for the passage of the oil collected by the hoods.

4. In aprinting-press the combination with the bed, of a trough-shaped guide, and a hollow runner open at the end 'and having an oil-distributing opening.

In witness whereof Ihave hereunto signed my namein the presenceof two witnesses.

. CHARLES POTTER.

Witnesses:

H. N. LOW, E. L. TODD. 

